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Children recover faster than adults in repeated sprints, but it is unclear if their aerobic responses differ.   Purpose  This study tested the hypothesis that aerobic response (VO 2 ) during repeated sprints is greater in preadolescent boys than in men. Further, this study compared normalization with conventional ratio-scaling and scaling with the use of body mass (BM) as a covariate.    Methods  Nine boys (age: 11.8 ± 0.6 years, swimmers) and 11 men (age: 21.7 ± 0.6 years, recreational athletes) performed 10 maximal 6-s cycling sprints separated by 24-s of passive recovery, against two loads (optimum and 50% of optimum). Oxygen uptake (VO 2 ) was measured continuously.    Results  Men’s mean power output (MPO) was greater than boys in each sprint, both in absolute (unscaled) values (  p  &amp;lt; 0.05) and when adjusted for lean leg volume (  p  &amp;lt; 0.05). Children had lower absolute VO 2  (  p  &amp;lt; 0.05) than men, but when it was adjusted for BM or power-output, VO 2  was comparable between men and boys. Thus, most of the difference in VO 2  between men and boys was due to body size and power-output differences.    Conclusion  Our results suggest that men and boys have similar VO 2  during repeated sprints when appropriately adjusted to body mass or power output. Results highlight the importance of using appropriate scaling methods to compare adults’ and children’s aerobic responses to high-intensity exercise.

Oxygen Uptake in Repeated Cycling Sprints Against Different Loads Is Comparable Between Men and Preadolescent Boys